Tool for precise drilling 8 mm hole

This is a tool for drilling 8mm hole. Drilling guide is a bearing which dimensions are: inner diameter; 8mm, outer diameter: 22mm and thickness is around 7.5 mm. dimension of holes for bearing are: inner diameter; 22.2 mm and depth 8mm. i printed it with 0.4 mm height to save time, but you can print it finer. You can see the video here: https://www.youtube.com/watch?v=RZjch_Od4M0